Thermal stabilization of diverse biologics using reversible hydrogels

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Vaccinology

Background:

• Maintaining the cold chain for biologics like vaccines is crucial but costly and prone to failure.
• Thermal degradation significantly impacts the efficacy and safety of biological products.
• Existing stabilization methods often lack versatility or pose safety concerns.

Purpose of the Study:

• To design and evaluate a novel reversible hydrogel platform for enhanced thermal stability of biologics.
• To demonstrate the broad applicability of the hydrogel for various biological entities.
• To assess the safety of the hydrogel components for potential in vivo applications.

Main Methods:

• Development of a polyethylene glycol (PEG)-based hydrogel using dynamic covalent boronic ester cross-linking.
• Encapsulation of diverse biologics including enzymes, vaccines, and viruses within the hydrogel matrix.
• Thermal stress testing of encapsulated biologics at elevated temperatures (up to 65°C).
• Preliminary in vivo toxicology assessment of hydrogel components.

Main Results:

• The reversible hydrogels successfully stabilized a wide range of biologics, including enzymes, H5N1 hemagglutinin vaccines, and adenovirus type 5, up to 65°C.
• A generalized protection mechanism was identified for thermal stabilization via direct encapsulation.
• Preliminary data indicated the hydrogel components are safe for in vivo use.
• The hydrogel platform demonstrated ease of use and versatility.

Conclusions:

• The reversible PEG-based hydrogel platform offers a safe and effective solution for enhancing the thermal stability of biologics.
• This technology can significantly mitigate the economic costs and health risks associated with cold chain dependency.
• The platform holds promise for improved storage and transport of vaccines and other sensitive biological therapeutics.